Even if /proc and /sys sub-files/sub-dirs are not backed-up, we should also fully remove /proc and /sys from the backup. I guess removing it from the backup would avoid that kind of issue at restore time.

Note that the WA to set -E "/proc /sys" to exclude them did not work for me.

The problem with /proc and /sys is that they are mounted in the chroot into which the system is restored before attributes are set up. Which is on one hand wrong, and then on the other hand leads to wrong xattr for those dirs. Excluding them is already done in mondoarchive. But the problem is that we need them at restore time. So probably something special for those has to be done.

It should not have a big impact in term of features so I lower the priority, and may even postpone it to post 2.2.9.2.